| 摘要 |
PURPOSE: A composition obtained by mixing boric acid with doughnut crumbs is provided which exhibits unexpectedly superior activity against crawling insects such as cockroaches or beetles. CONSTITUTION: About 500g doughnut crumbs are mixed with 100g boric acid, a spoonful of the mixture is sprayed in a cockroaches-infested area, based on a building of 20 pyong(3.954 sq. yds.), resulting in the death of the infected roach. And death takes approximately 15 days after contact with the mixture.
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